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Solar Eclipse: Of Celestial Mechanics And The Eye Of God
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Solar Eclipse: Of Celestial Mechanics And The Eye Of God
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Bianca
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Solar Eclipse: Of Celestial Mechanics And The Eye Of God
«
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July 22, 2009, 07:27:12 am »
Solar eclipse: Of celestial mechanics and the Eye of God
Richard Ingham
Jul 20, 2009
PARIS
(AFP)
– Total solar eclipses have struck awe or fear into hearts for millennia, but scientists are more interested in the unusual mathematics behind the gold-and-indigo lightshow.
Superstition has always haunted the moment when Earth, Moon and Sun are perfectly aligned. The daytime extinction of the Sun, the source of all life, is associated with war, famine, flood and the
death or birth of rulers.
Desperate for an explanation, the ancient Chinese blamed a Sun-eating dragon.
The Vikings believed the culprits were two giant wolves, Skoll and Hati, which chased the Sun around the sky.
Among Indians in South America, an eclipse was simply, terrifyingly, "the Eye of God."
But a remarkable act of celestial geometry explains it all.
When the Moon glides between Earth and the Sun, it casts a cone-shaped shadow, called an umbra, that races from West to East.
The Sun is 400 times wider than the Moon, but it is also 400 times farther away. Because of the symmetry, the umbra, for those on the planetary surface, is exactly wide enough to cover the face of the Sun.
At an eclipse's height, a halo of gold, called a corona, flares around the darkened lunar disc, while the sky turns an eerie dark blue, disorienting birds and causing bats to emerge from their roosts in the belief that night has fallen.
Total solar eclipses are exceptional events, and the one that crosses Asia on Wednesday is especially so.
If the clouds hold back, it could be the most-watched eclipse in history, for its path of totality traverses the world's two most populous countries, China and India.
People living outside totality, from Japan in the north to parts of Indonesia in the south, will be in the penumbra, or partial shadow, which means a "bite" seems to have been taken out of the Sun.
The lunar shadow will first strike the Gulf of Khambhat, off western India, at 0053 GMT, taking eight minutes to cross the centre of the country before entering northern Bangladesh and the eastern tip of Nepal.
It then slices through some of China's biggest cities, including Chengdu, Chongqing and Wuhan, before arriving at Shanghai, a city of 20 million souls.
"This may be the most people that have ever been in the Moon's shadow at once," say NASA eclipse experts Fred Espenak and University of Manitoba meteorologist Jay Anderson.
The umbra then flits across the western Pacific, where at one point the path of totality will be 258 kilometers (161 miles) wide, while the maximum duration of totality will be six minutes, 39 seconds.
By eclipse standards, this is "a monster," Espenak and Anderson estimate in the US magazine Sky & Telescope. We will have to wait until 2132 before the totality duration is beaten.
A total solar eclipse usually occurs every 18 months or so. Any given spot on Earth's surface will host a total eclipse on average once every 375 years.
Until now, the most-watched eclipse occurred on August 11, 1999, when the umbra raced from Britain, across Western Europe, part of the Middle East and India.
The last total solar eclipse was on August 1 2008, and also crossed China.
The next will be on July 11 2010, but will occur almost entirely over the South Pacific, where Easter Island -- home of the legendary moai giant statues -- will be one of the few landfalls.
That will be wonderful news to "eclipse junkies," an eclectic army that pursues total eclipses around the world, sometimes hiring seats on planes or ships to get the best view.
+ SAFETY FIRST:
Eclipses, even partial ones, should NOT be viewed with the naked eye or through binoculars, a telescope, beer bottle or photographic film, as this can permanently damage the retina. Observers should use proper optical filters such as welding-goggle glass, eclipse spectacles or a solar projection kit for their telescope. The safest way to view is on television or the Internet.
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